If I’ve learned anything from Breath of the Wild, all you gotta do is walk onto the troll’s hand, then in his sleep he will go scratch his belly and in doing so, gently deposit you next to the treasure.

Ok, here’s the plan. Good Good Girl does a ring toss with her halo onto the Troll King, then Defendress asks him nicely to hand over the box. If giving them the artifact is the RIGHT thing to do, he will. If NOT, then he’ll tell them all what’s what, and they can go from there.